Television – Synchronization – Locking of video or audio to reference timebase
Reexamination Certificate
2011-08-23
2011-08-23
Tran, Trang U (Department: 2422)
Television
Synchronization
Locking of video or audio to reference timebase
C348S512000, C348S738000
Reexamination Certificate
active
08004609
ABSTRACT:
There is provided an amplifier that measures a display delay time caused until a video is displayed actually after a video signal is generated, and sets automatically a delay time of an audio signal such that an audio synchronizes with this display. Test video data is stored in a memory11. This test video data is video data that generates a clear change in luminance in such a manner that a screen is changed suddenly from deep black to pure white. This test video is output to a video display device2such as PDP, for example, and a delay time generated until the test video is displayed actually after this test video is output is measured. Since the luminance of the screen is changed suddenly when the test video is displayed actually, this change can be sensed by an optical sensor20. The audio signal is delayed by setting this delay time in an audio signal processing portion13, so that the video can synchronize with the audio.
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Pillsbury Winthrop Shaw & Pittman LLP
Tran Trang U
Yamaha Corporation
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